Micromort

Tue, 18 Feb 2025 00:00:00 +0000

A micromort (from micro- and mortality) is a unit of risk defined as a one-in-a-million chance of death. Micromorts can be used to measure the riskiness of various day-to-day activities. A microprobability is a one-in-a million chance of some event; thus, a micromort is the microprobability of death.

— Wikipedia

I discovered this word while reading this question:

How many micromorts is a day in the life of a 90-year old?

Eager vs lazy evaluation

Sat, 15 Feb 2025 00:00:00 +0000

TIL `bool::then_some` in Rust

While participating in Advent of Code, I learned about bool::then_some. Because I tried to finish the problem on time, I did not read fully the documentation. I wrote a get helper function to access an element in a 2D array. The code (simplified to 1D) looked like:

fn main() {
 dbg!(get(&vec![42, 51], 4));
}

fn get(v: &[u8], i: usize) -> Option<u8> {
 (i < v.len()).then_some(v[i])
}

It compiles fine, but it crashes:

thread 'main' panicked at src/main.rs:6:29:
index out of bounds: the len is 2 but the index is 4
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Cargo-Process exited abnormally with code 101 at Thu Feb 13 21:04:58

What is wrong with this code?

til on Lud.cc ~ Ludwig's digital home

Micromort

Eager vs lazy evaluation

TIL bool::then_some in Rust

TIL `bool::then_some` in Rust